Ripples of stormy weather

Heike Langenberg

Nature, 2005, vol. 433, issue 7022, 115-115

Abstract: Snowball Earth goes down a storm The Snowball Earth hypothesis is the controversial suggestion that the Earth froze over completely, with glaciation extending into the tropics, at least twice during the Neoproterozoic. When one of these glaciations ended 635 million years ago, rapid melting of so much ice would have caused a large sea level rise. Carbonate sediments formed at this time have now been found to preserve evidence of giant wave ripples, sea-bed structures that could have formed only under very long period surface gravity waves generated by high-speed winds. This suggests that deglaciation was associated with exceptionally severe wind and wave conditions. Snowball or not, it was certainly a time of climate turmoil.

Date: 2005
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DOI: 10.1038/433115a

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